CytoSport Muscle Milk Coffee House Ready-to-Drink Shakes are a convenient non-dairy protein shake with 20g of high-quality protein and 120mg of caffeine and zero sugar per bottle. These delicious shakes can be used as an on-the-go breakfast option or an anytime snack. The caffeine in CytoSport Muscle Milk Coffee House protein shakes is similar to a cup of coffee.